<!DOCTYPE html>
<html>
  <head>
    <title>Hello Vue button!</title>
    <script src="vue.js"></script>
  </head>
  <body>
    <div id="app">
      <button id="tester" v-on:click="do_click">Click me!</button>
    </div>
    <script src="hello_button.js"></script>
  </body>
</html>